Siemens SIMATIC Rack PC 840 V2 - Internal Ports

Detailed descriptions
16.1 Motherboard
SIMATIC Rack PC 840 V2
Operating Instructions, Edition 05/2006, A5E00248055-04
16-11
16.1.5 Internal ports
Pin assignment of the internal ports
Interface Position Connector Description
Memory Internal X3, X4, X5 3 DIMM sockets, 64-bit
Processor Internal X1 Socket for FCPGA mobile processor
Bus expansion Internal X20 Socket for extended bus, assigned with
ISA and PCI bus signals
Power supply Internal X50, X5000 20-pin power connector, 4-pin power
connector
Floppy Internal X26 Two drives can be installed (82078
compatible) 360 kB, 720 kB, 1.2 MB,
1.44 MB 3F0h–3F7h, 370h–377h,
switchable IRQ 6, edge triggered
34-pin, socket for standard floppy disk
drive
primary EIDE (e.g. hard
disk drive)
X7 Internal
Secondary EIDE
(e.g. CD ROM)
Internal X11 170h–177h, 1F0h–1F7h, switchable
IRQ14, IRQ15, edge triggered 40-pin,
2.54 mm male connector, operation of up
to two disk drives
PS connection for CPU
fan
Internal X41 CPU fan power supply, 3-pin male
connector
PS connection for
equipment fan
Internal X42, X43 Power supply for equipment fan
(controlled), 3-pin, male connector
Connection for SCSI LED Internal X39 Input for SCSI drive activity display
Internal USB port Internal X2033 Connection for the USB port cable to the
front panel of the computer
Front panel port X44 OP connection
Assignment for SCSI activity connector, X39 Type JST B2B-PH-SM3-TB
Pin No. Abbreviations Meaning Input /Output
1 NC -
2 SCSI HD_N 0-V level means that the SCSI port is active Input